Manufactured Stormwater Treatment Measure Maintenance Plan for
[[== Insert Project Name ==]]
[[== Insert Date =]]
Manufactured Stormwater Treatment Measures are PROPRIETARY treatment devices that tend to
be installed below ground and operate using some type of proprietary filter media, hydrodynamic
separation, or sedimentation and screening. Common examples of manufactured treatment
measures include manufactured media filters, inlet filters or drain inserts, oil/water separators and
hydrodynamic separators. In August 2004, the Regional Water Board’s Executive Office wrote a
letter stating that a project relying on inlet filters or oil/water separators as the sole treatment
measure would be unlikely to meet the maximum extent practicable standard of the National
Polutant Discharge Elimination System Permit. See the Countywide C.3 Technical Guidance
(www.flowstobay.org) for more information.
Project Address:___________________________________________
Assessor’s Parcel No.:
Property Owner:
Phone No.:
Designated Contact:
Phone No.:
Mailing Address:
The property contains [[== insert number ==]], [[==insert device type/manufacturer==]]
located as described below and as shown in the attached site plan1.
 [[==device name ==]] is located at [[== describe location ==]].
 [[== Add descriptions of other products, if applicable. ==]]
I.
Routine Maintenance Activities
The principal maintenance objective is to prevent sediment buildup and clogging, which
reduces pollutant removal efficiency and may lead to failure of the manufactured treatment
measure. Routine maintenance activities, and the frequency at which they will be
conducted, are shown in Table 1.
Table 1
Routine Maintenance Activities for Manufactured Treatment Measures
No.
1
Maintenance Task
Frequency of Task
1
Inspect for standing water, sediment, trash and debris.
Monthly during rainy season
2
Remove sediment, trash and debris from sedimentation
basin, riser pipe and filter bed, using vactor truck method.
Dispose of sediment, trash, filters and debris properly.
As needed
3
Ensure that manufactured treatment measure drains
completely within five days.
After major storm events and as
needed.
4
Inspect outlets to ensure proper drainage.
Monthly during rainy season, or as
needed after storm events
5
Follow manufacturer’s guidelines for maintenance and
cartridge replacement.
As per manufacturer’s specifications.
6
Inspect manufactured treatment measure, using the
attached inspection checklist.
Monthly, or after large storm events,
and after removal of accumulated
debris or material
Attached site plan must match the site plan exhibit to Maintenance Agreement.
Page 1
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NDS Approved 12/5/07
Manufactured Treatment Measure Maintenance Plan
Property Address:
Date of Inspection:
Treatment Measure No.:
II.
Prohibitions
Trees and other large vegetation shall be prevented from growing adjacent to the
manufactured treatment measure to prevent damage.
Standing water shall not remain in the treatment measures for more than five days, to prevent
mosquito generation. Should any mosquito issues arise, contact the San Mateo County Mosquito
Abatement District (SMCMAD), as needed for assistance. Mosquito larvicides shall be applied
only when absolutely necessary, as indicated by the SMCMAD, and then only by a licensed
professional or contractor. Contact information for SMCMAD is provided below.
III.
Mosquito Abatement Contact Information
San Mateo County Mosquito Abatement District
1351 Rollins Road
Burlingame,CA 94010
PH:(650) 344-8592
FAX: (650) 344-3843
Email: info@smcmad.org
IV.
Inspections
The attached Treatment Measure Inspection and Maintenance Checklist shall be used to
conduct inspections monthly (or as needed), identify needed maintenance, and record
maintenance that is conducted.
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Page 2
Manufactured Stormwater Treatment Measure
Inspection and Maintenance Checklist
Property Owner:
Property Address:
Date of Inspection:
Type of Inspection:
-Wet Season
System Type:
Installer/Contractor:
Manufacturer:
Defect
Inspector(s):
Conditions When Maintenance Is
Needed
Maintenance
Needed? (Y/N)
Comments (Describe maintenance completed and if
needed maintenance was not conducted, note when it will be
done)
Results Expected When
Maintenance Is Performed
1. Sediment, trash
and debris
accumulation on
Filter
Sediment, trash and debris
accumulated in the sedimentation
basin, riser pipe, retention pipes and
filter bed. Filter does not drain as
specified.
Sediment, trash and debris
removed from sedimentation
basin, riser pipe and filter
bed and disposed of
properly. Filter drains per
design specifications. Empty
cartridge should be
reassembled and reinstalled.
2. Standing water
Manufactured treatment measure
Clogs removed from filters,
sedimentation basin, riser
pipe and filter bed. Filter
drains per design
specifications.
does not drain within five days after
rainfall.
3. Mosquitoes
Evidence of mosquito larvae in
manufactured treatment measure.
Clogs removed from
sedimentation basin, riser
pipe and filter bed. Filter
drains per design
specifications.
4. Miscellaneous
Any condition not covered above that
needs attention in order for the
manufactured treatment measure to
function as designed.
Meet the design
specifications.
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Manufactured Treatment Measure Maintenance Plan - Page 3